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A good sewage system is essential for a healthy environment. Duraco caters for all your sewerage needs.

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A Grease trap is a plumbing device which intercept fats, oil, grease, and solids (fogs) from the kitchen sink before they enter the sewer network or a wastewater disposal pit. It prevents blockage of the evacuation pipes, the sewer network as well as the absorption pit.

When the water from the kitchen is directly released in the sewer network, it causes sewer pipe blockage and is the leading cause of sewer overflows. Even if accumulated FOG does not escalate into blockage and sanitary sewer overflows, it can disrupt wastewater utility operations and increase operations and maintenance requirements.

Thus, for both domestic and commercial kitchen operations, it is highly recommended to fit a grease trap to intercept fats, oils and grease before entering the sewer network.


  • Made of 100% virgin Polyethylene
  • Normally placed below ground level to avoid odours
  • Outfitted with a UV stabilised screwed lid.
  • Available in six capacities
  • Colour: Black
  • 140L - Max 1 sink
  • 200L - Max 2 sinks
  • 350L - Max 3 sinks
  • 1800L - Max 12 sinks
  • 3000L - Max 24 sinks
  • 4700L - Max 36 sinks

Common wastewater from the kitchen sink contains small amounts of Fats, Oil, Grease and Solids (FOGS) which enter into grease trap.  The solid food particles sink to the bottom while the lighter grease and oil floats to the top and form a floating scum layer. The latter is very slowly digested and broken down by the microorganisms during the aerobic digestion process.

The relatively grease-free water is then fed into an absorption pit. The food solids at the bottom and floating oil and grease must be periodically removed in a similar manner as with septic tank pumping. A traditional grease trap is not a food disposal unit. Unfinished food must be scraped into the garbage or food recycling bin. Milkshakes, gravy, sauces and food solids must be scraped off the dishes before they enter the sink or dishwasher.

To maintain some degree of efficiency, there has been a trend to specify larger and larger traps. Unfortunately, providing a large tank for the effluent to stand means that food waste scraps also have time to settle to the bottom of the tank, further reducing the available volume and adding to the clean out problem. Also, rotting food contained within an interceptor breaks down, producing toxic waste (i.e. sulfur gases) – hydrogen Sulphide combines with the water present to create sulfuric acid. This attacks mild steel and concrete materials, resulting in gradual degradation on the other hand, polyethylene has acid-resisting properties. A bigger interceptor is not a better interceptor; in most cases, having multiple interceptors in series will separate grease much better.


Respect the following steps when installing a grease trap:

Step 1: Location: -

Determine a suitable area to install the grease trap. The unit must be place in an outside area accessible enough for regular maintenance. To reduce pipe blockages, avoid placing the grease trap far from the kitchen sink.

Step 2: Connection: -

The next thing that you have to do after you have determined the location of the grease trap is to connect it. There are only two connectors. The inlet should be connected to the sink pipe and the outlet goes directly to the absorption pit.

Step 3: Excavation: -

Dig to a depth that will allow the grease trap cover to come flush with the ground.

For domestic models (140, 200 and 350 L) allow 160mm around the tank. For industrial models (1,800, 3,000 and 4,700 L) allow 230 mm on both sides and both ends of the tank.

Step 4: Bedding: -

Allow for a minimum of 150 mm of compacted bedding material rock sand. Bed the grease trap and make sure it is placed levelled.

The grease trap is supplied with PVC sleeves at the inlet and outlet. The inlet and outlet pipes should be glued to the sleeves using standard PVC glue.

Step 5: Backfilling: -

Ensure the tank lid is properly screwed on the grease trap cover. Fill the tank with water through the inlet as you backfill, keeping the water level even with the backfill level. This will prevent possible distortion of the tank and its manhole. Do not remove the lid until the end of the backfill process.

Backfill in layers of 200 mm at a time and properly compact each layer. Ensure to compact each end first. Tamp and compact the backfill under the inlet and outlet before fixing the pipes.

For the industrial models, the maximum backfill over the top is 300 mm. Mound fine soil over the top to provide positive drainage. Considering the domestic models, the cover must come flush to the ground.

NOTE: In case the grease trap needs to be installed with more than 300mm of soil above its top, it must be protected by a heavy duty concrete slab, without resting on the grease trap. THE SLAB MUST REST ON FIRM SOIL AROUND THE TANK

Step 6: Polyethylene (P.E) Extension: - (for industrial models ONLY)

In case the manhole screwed lid doesn’t reach the ground level, a polyethylene extension will be required. Install the extension to the manhole outlet before starting the backfill process. Make use of our extension EXCLUSIVELY. The screwed lid supplied with grease trap will fit the P.E extension.

Step 7: Drain Field Material: -

The home sewer drain needs to slope at least ¼ inch per foot downhill to the inlet of the grease trap inlet and the outlet pipe must cater for a downhill slope of 1/8 inch per foot to the absorption pit. The absorption pit should be at a distance of not more than 3 m from the grease trap and its volume must be at least similar to that of the grease trap


Failure to comply with the points below voids the warranty

  • Do not install any tank in water saturated clay or in high water table. The tank may collapse and its content will escape.
  • Tanks are not fire-resistant. Do not store them near an open flame or heat in excess of 180°F,
  • Do not install any tank under the path of vehicles or heavy equipment unless protected by a heavy duty concrete slab, without resting on the grease trap.
  • When the grease trap is pumped for normal maintenance; it should be refilled immediately.
  • Our grease trap are designed only for use as underground tanks.
  • Protect the tank from sharp objects which could puncture it and cause leakage.
  • Avoid abusive use of detergent